The under side of cars are not very aerodynamic with the exhaust pipes and suspension components hanging in the breeze.
The VT Commodore S & SS front skirt extension reduces air from going under the car. Again reducing drag.
same for the VS S and SS
the rear boot lip spoiler fitted to the VR and VS Commodore S pack also helps the cars aerodynamics by promoting a clean air separation.
as does the sharper trailing edge of the VY and VZ commodore. Much more aerodynamic than the rounded off VT and VX Commodore boot lid.
